I would tell your customer even if you clean out a virus the virus will leave holes in the OS making it vulnerable to other attacks and on top of that unstable. Having that many viruses, spy ware, ad ware, and mal ware would be a very good reason to reload the system. The fact that you spent time trying to remove the viruses just lost you time and we know that time is money. But if you really want to remove that virus I would pull the hard drive and place it in another computer as a slave and run the latest antivirus. This should remove it. The fact is the virus is running in your processes and himem, trying to remove it will just give you what you already know (it comes back under a different name). So you are on the right track now but make sure that the customer doesn’t back up the virus as well.